#!/usr/bin/env node


const cp = require('child_process');
const cat = cp.spawn('cat',['data.txt']);
const sort = cp.spawn('sort');
const uniq = cp.spawn('uniq');

cat.stdout.pipe(sort.stdin);
sort.stdout.pipe(uniq.stdin);

uniq.stdout.pipe(process.stdout);
uniq.stderr.pipe(process.stderr);
